code: def exitcode(self):
      if self._start_called and not self.is_alive():
          return 0
      else:
          return None
  
imports: import threading
  import sys
  import weakref
  import array
  from .connection import Pipe
  from threading import Lock, RLock, Semaphore, BoundedSemaphore
  from threading import Event, Condition, Barrier
  from queue import Queue
label_desc: Use image node_id 3 for calling the DummyProcess obj's underlying member method code with example usage: obj.exitcode() and returns: int, None